1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1992 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */ 31 32 /*LINTLIBRARY*/ 33 #include <signal.h> 34 #include <sys/types.h> 35 #include <sys/wait.h> 36 #include <string.h> 37 #include <sys/file.h> 38 39 extern int execl(); 40 41 int 42 system(s) 43 char *s; 44 { 45 int status; 46 pid_t pid, w; 47 register void (*istat)(), (*qstat)(); 48 char path[256]; 49 char *c; 50 51 while (*s == ' ' || *s == '\t') 52 s++; 53 54 if (strncmp(s, "/usr/ucb", strlen("/usr/ucb")) == 0) { 55 /* check if command is under /usr/ucb, if not 56 * replace /usr/ucb with /usr/bin. 57 */ 58 strcpy(path, s); 59 if ((c = strchr(path, ' ')) != NULL) 60 *c ='\0'; 61 if (access(path, F_OK) == -1) { 62 strncpy(path, "/usr/bin", strlen("/usr/bin")); 63 if (c != NULL) *c = ' '; 64 s = path; 65 } 66 } 67 else if (strncmp(s, "/bin", strlen("/bin")) == 0 || 68 strncmp(s, "/usr/bin", strlen("/usr/bin")) == 0) { 69 /* if /usr/bin is specified, first check if a command 70 * with the same name exists under /usr/ucb */ 71 strcpy(path, "/usr/ucb"); 72 if (strncmp(s, "/bin", strlen("/bin")) == 0) 73 strcat(path, strchr(s+1, '/')); 74 else { 75 c = strchr(s+1, '/'); 76 strcat(path, strchr(c+1, '/')); 77 } 78 if ((c = strchr(path, ' ')) != NULL) 79 *c ='\0'; 80 if (access(path, F_OK) == 0) { 81 if (c != NULL) *c = ' '; 82 s = path; 83 } 84 } 85 86 if ((pid = vfork()) == 0) { 87 (void) execl("/bin/sh", "sh", "-c", s, (char *)0); 88 _exit(127); 89 } 90 if (pid == -1) { 91 return (-1); 92 } 93 istat = signal(SIGINT, SIG_IGN); 94 qstat = signal(SIGQUIT, SIG_IGN); 95 w = waitpid(pid, &status, 0); 96 (void) signal(SIGINT, istat); 97 (void) signal(SIGQUIT, qstat); 98 return ((w == -1) ? -1: status); 99 } 100